You can also buy sheets with a repeating design that dually serves as a this-way-is-up indicator.
Another option which I do is use a permanent marker to put an indication on the sheet label (I go for "↕ side" and "↔ top", but whatever works for you).
Another trick is to fold opposite corners together, they won't match up, the short side is usually the foot of the bed.
I don’t lay down on a bed. Checkmate!
Correct. You lie on a bed. 😁
Lol there I changed it
Which side is the righthand side of a bed? Is it my right when i'm laying on my back on the bed, or my right when i'm standing at the foot of the bed facing it (which is usually where i'm standing when i'm about to put a fitted sheet onto the mattress)?
Efficiency in all walks of life.